Balance of Payments contains A LOT of HL. If you're an SL student please be aware of what you need to revise and what you can ignore
The Balance of Payments (Extended Reading)
Interesting examination of surpluses and deficits and the interconnection of the world of trade - HL stuff, but worth the time.
The Balance of Payments (SL UNIT)
Calculating the BoP
Relationship b/t BOP and the Exchange Rate (HL ONLY)
Compare Floating & Fixed Exchange Rates (HL ONLY)
Implications of Current Account Deficit (HL ONLY)
Methods to correct a persistent Current Account Deficit (HL ONLY)
The Marshall Lerner Condition and the J Curve effect (HL ONLY)
Implications of Current Account Surplus (HL ONLY)
A great summary